Door lock



Sep. 30,, 1953 R. MRFLE DOOR LOCK 3 Sheets-Sheet 1 Filed June 23,71955 2. m4 .w W a Www Sept. 30, 1958 R. MARPLE 2354275 v DOOR LOCK Filed June 23, 1955 3 Sheets-Sheet 2 E L P R A M R DOOR LOCK Filed June 23, 1955 5.. W T N 'I UM; F

ttes Fate;

assams Dona root;

Roilo Mai-pie, Jackson, Mieli., assigno to Hancock industries, Inc., a Corporation of l* This invention relates to door locks, and more particularly to latching mechanisms adapted for use with doors on Vehicles and other locations in which the latch is subjected to jarring and vibration. This application is related to applicanfs prior Patent No. 2,803,955 issued August 27, 1957, the latching mechanism in this application being an improved version of that disclosed in the patent.

lt is an object of the present invention to provide a novel and improved latching mechanism which incorporates take-up action for preventing looseness in the latch due to jarring and vibration, and which is nevertheless extremely easy to unlatch with a minimum of manual effort.

It is another object to provide a latching mechanisrn of the above nature, in which the take-up action is continuons throughout its range, and wherein the take-up and dogging means are completely retracted from engagement with the bolt during opening movement of the door, thereby eliminating all resistance of the latching parts to opening of the door, and providing a freely movable bolt.

Other objects, features, and advantages of the present invention will become apparent from the subsequent description, taken in conjunction with the accompanying drawings.

In the drawings:

Figure 1 is an end elevational view of a bolt assembly for a door latch constructed in accordance with the principles of the invention, parts being broken away for clarity, showing the outside rollback and dogging mechanism in latching position;

Figure 2 is a side elevational view of the structure of Figure 1, showing the inside rollback and looking slide;

Figure 3 is a fragmentary cross-sectional view taken along the line 3-3 of Figure 1 and showing the Cooperation between the roller cam and the roller retracting member;

Figure 4 is a view similar to Figure 1 showing a portion of the mechanism with the outside rollback in its unlatching position;

Figure 5 is an end elevational view of a modified form of the invention in which a toggle linkage is used to positively retract the reaction member, the parts being shown in their latching position, parts being broken away for clarity;

Figure 6 is a fragmentary view in cross-section taken along the line 6-6 of Figure 5 and showing the roller and its cooperating parts;

Figure 7 is a view similar to Figure 5 showing the parts in their unlatching position;

Figure 8 is a rear elevational view of still another embodiment of the invention, similar in principle to that of Figures 5-7 but in which the toggle linkage is connected to the other end of the reaction member, parts being broken away for clarity; and

Figure 9 is a view similar to Figure 8 showing the mechanism in unlatching position.

As shown in the illustrated embodiments, the invention vthe dogging tooth to latch the bolt.

2,854,275 Patented Sept. 30, 1958 comprises a mounting plate having a conventional multitoothed rotary bolt and an abutment member for cooperation with a keeper of the type shown for example in Marple Fatent No. 2,195,l79 issued March 26, 1940. The combined dogging and take-up means comprises a roller movable into and out of engagement with the dogging teeth on the rotary bolt. A reaction member is provided the dogging means, this taking the form for example of a track inclined With respect to the dogging bolt teeth in such a manner that the roller, when urged along the track in one direction, will urge the bolt in a latching direction to provide the take-up motion. This basic dogging and take-up construction is disclosed and claimed in copending application Serial No. 218,447, filed March 3'3', 1951, by the present applicant, now Patent No. 2,712,957, granted July 12, 1955. It will be under- Stood that other forms of take-up or dogging action could be used within the principle of the invention.

During latching movement of the bolt assembly, the roller track is held in its operative position and as the bolt engages the striking surface of the keeper and is rotated, one of the dogging teeth passes under the roller which is free to retract, being spring-urged into position behind The forces between the latched bolt, the roller and the track are such that the roller cannot be forced from its latching position by the bolt, but provides a take-up action causing further latching rotation of the bolt as the door undergoes jarring or vibration. When it is desired to unlatch the bolt, the holding means for the track is released, permitting the track to be retracted from its operative position as the door is opened. 'f his release of the track holding means may be supplemented by means for positively retracting the track from its operative position, as shown in the embc-dirnents of Figures 5 7 and 8 and 9. Means are also provided for positively withdrawing the roller from engagement with the bolt after initial release of the track. The roller, which would otherwise be moved against its spring pressure by the bolt as the latter rotates in an unlatching direction, is thus withdrawn from all contact with the Iotating bolt. Opening movement of the door therefore does not involve any action against sprinU pressure, and the movement may be easily effected with an absolute minimum of resistance. The latching parts may then be returned to their latching position.

Referring to the embodiment of Eigures 1 4, the bolt assembly coinprises a mountirig plate 11 having a base 12. and a fiange 13. A multi-toothed rotary bolt 14 is supported by mounting plate 11, this bolt being provided with a prurality of (logging teeth 15. A deck or cover plate shown at 16 in dotted lines in Figure 1 is secured by tabs 17 in Spaced parallel relation with base 12. Guided between base 12 and cover plate 16 is a roller shown in Figures l and 2, which is movable between latching position in engagement with dogging teeth 15 a retracted or unlatching position as shown in Figure A spring 19 is fixed at one end 21 between cover and base 12, the other end 2-2 o-f the spring being roller Spring 19 nrges roller 18 to in Figures 1 and 4 to provide the camming or take-up action by engagement of the roller with dogging teeth 15.

A reaction member is provided in the form of a track 23 having a surface 24 along which roller 18 rides as urged by spring 1%. Track 23 is disposed above bolt 14 and is pivotaliy supported by a pin 25 secured between cover pate and base 12 of the mounting plate adjacent fiange 13. Track 23 is movable between an operative position as shown in Figure 1 and a retracted position shown in Figure 4. When in its operative position, surface 21% of track 23 is so inclined relative to the dogging surtaces of teeth 15 tnat as roller 18 moves to the right along surface 24, bolt-14 will be Arot-ated Vcounterelockwise in Figure 1. gages a keeper 26 as shown partially in dot-dash lines in Figure 1,7thisl take-up action will cause the bolt assembly anddoor to V-be moved to the right, improving the firmness of closure. This take-up action is described in detail and claimed in aforementioned Patent No. 2,712,957.

Mean's'are provided for releasably holding track v23 in 'its operative position. VIn the embodiment of Figures 'lt-4,, this meansicomprises alholding member 27 pivoted at;28 on base 12V and havinga toe 29 engageable with a shoulder-31at the outer end of track 23. When toe 29 is on shoulder 31, track 23 will be held securely in its operative position, the force transmitted fromV shoulder 31 to toe passing through pin ,28.

:Holding member27 is wingable from its holding positionas shown in Figure 1 to releasing position shown Since a lathing tooth on bolt 14 ening plate and aiigned with roller 18. Edge 48 vis inclined upwardly and to the left in Figure 1, and moveby a lever 51 carriedby pivot 41,011V base 12. Lever 51 is provided with an arm 52 extending toward fia'ngeV 13 and engageable by an arm 53 of rollback 49, when the latter is swnng counterclockwise in Figure 2;` "Ihe opposite end of ,lever 51 is provided with va shoulder 54 engageable witha finger 55 `on outside rollbackl 32.

inzlifigure' 4 byV means of an outside rollback 32 pivoted at' 33itoV the upper portion of base V12. In particular, a pin-and-slotV connection is provided between members 27 and 32, thisrconnection taking the form of a pin 34 on the upper Vend of member 27 extending through a slot `35 inrollbackj32. A spring partially shown at. 36 is providedpbetween mounting plate 11 and a shoulder. 37 on rollback`32, urging .this member in -a clockwise direction as seen in 'Figures 1 and 4, and thus'urging toe '29 into engagement with shoulder 31. The outer surface of shoulder 37 isadapted to be engaged by an outside door handle (not shown) to move rollback 32 to- Ward its unlatching position. A sloping surface 38 is provided atl the end of track 23 so that toe 29 may be v guided when track 23 is away from its operative posiroller, retracting'lever 39 pivoted at 41 between base 12 and cover plate 16. Lever 39'has an arm 42 'extending downwardly from pivot 41 and' engageable with a reduced shoulder'portion 43 of roller 18, as best seen in Figure 3. fThe engagement between arm 42 and shoulder`43 issuch that when lever 39 swings clockwise, roller 18 will be moved to the 'left in Figure 1- against the action of spring 19. 'l'fhecsurfarce 44 of arm 42 which engages shoulder 43, is so inclined'as to impart an upward component of movement to roller 18 during its retracting movement, so that it will'be lifted clear of dogging teeth 15 as shown in figur 4- In the illustrvated embodiment, a connection is provided between lever 39 and rollback 32 in order that the lever and the Vtrack holding means may be actuated by a single operaton This connection comprises an arrn 45 on the lever provided with a shoulder 46 at its outer end. Rollback 32 has a finger 47 engageable with the underside of shoulder 46 when the rollback is moved counterclockwise in Figurerl. It wiil be noted that when in its'normal position; shown in Figure 1, finger 47 isspaced from shoulder 46 a sufiicient distance to permit toe29 of track holding member V27 to be disengaged from shoulder 31 of track 23, before lever 39 is swung clockwise during the unlatching operation. As a result of this action, track v23 is free to be retracted under the influence of roller 18 when the latter is moved away Vfrom bolt 14;

Means may be provided for preventing movement of roller 18 toward pivot of track-23, during initial rotation of bolt 14 in an unlatching direction, and guiding it toward the other end of the track. lt will be appreciatedthat^if`bolt '14 is rotated'in an unlatchingdirection (clockwise in Figure 1) with holding member 27 free from track 23 but with lever 39 still in its inoperative position, roller -18 could .be moved by the rotating bolt toward pivotr25 of track 23, and could possibly'become vjammed in the vbolt teeth or otherwise increase the rcsistance 'against which lever 39 must act. means in the present embodiment comprises an edge' 48 `lanced or otherwise formed from base 12 of the mount- Finger 55 is spaced above finger 47 so-that both shoulders 46 and 54 of levers'39 and 51respectively are, d1sposed between these fingers. In the normal positlon shown in Figure 1, shoulder 54 adjacent ingr'SSLso' that when le'ver 51 is swung clockwise in, thlsfigure'by unlatching movement of theinside rollback, outside rollback 32 will rotate in its counterclockwise or `unlatching direction. Toe 29 will thus be retracte'd from 'shoulder'31 of track 23, and finger 47 of the outside rollback will engage shoulder 46. Roller18'and track v23 will I `Meansare also provided for'positively retracting roller i 18 When the bolt is unlatched. ;This means comprises a The guide v therefore be retracted in the 'same manner as Voccurs when `outside rollback 32 is actuated directly Ibytheoutside door handle. It will be noted that spring 36,1which urges outside rollback 32 clockwise in Figure'l, will maintain'bothlever 51 'and inside 'rollback 49Vin their-normal prositions. i V

'Means are also provided, in this embodiment-of-'the invention, for `looking the outside rollback against delatching movement. ThisV means comprises a looking slide 56 mounted on fiange ,13 andv movable between `a lower unlocking vposition shown inV Figure 2 and an upper looking position. An overcenterV spring 57" is provided for holding slide 56 in either'of its positions The' upper end of slide 56 is provided With a'pair of spaced finger 58 land 59. A slot 60 is provided in fiange ,13, and' one end 61 of a'loc kingzlever 62 is disposed Within 'this slot in' 'Figure 1, portion 63 thereof will beV alignedV with p edge 64j-of lever 27, thus preventingsubstantial clock- Wise movernent of this lever. jSincc lever 27" is'fconnected by pin 34 and slot 35: with outside. rollback ;32; unlatching .movement of roller-18 andtrack 23 *by either rollback will be prevented.

Locking slide 56 may be'actuated between its positions by reverse movement of inside rollback 49.-or by Va1ley station` shaft 65, In particular, the upperjend' qf-fslide 56 `is provided with a' shoulder ja'gainst' which the upper edge 67 of inside rollback49 will'bear-whnzthis rollback Vis swung clockwise .from its neutraljposition shown in'Figure 2. .The'lower end'ofrsli'dejpSfis provided With a projection 68 engageable ,by a forkedfrcam 69 mounted Von key station shaft 65, thelatterlbeing rotatably. supported by flange 13 of the mounting plate. Cam 69 isrotatableV from its neutral position shownin Figure 2 in a counterclockwise pdirection, the lower` end p of the cam engaging projection.68 tomoye the ,looking slide to its blocking position, :Whe'nrrotated` clockwise from its neutral position, cam 69 will1engage'projection 68. to move looking slide 56. to its .unlocking position.

Kick-o means are also providedfor movinglrocking. slide 56 to its unlockingposition'when theinsidephanr- '53 of inside rollback 49' fwhen the'locking lever 'is in' its locking position. As will be seen in Figure 2, counterclcckwise or unlatching movement of inside rollback 49 will cause engagement of end of the rollback simultaneously with toe 61 and end 52 of lever 51. Looking lever 62 will thus be moved to its unlocking position, enabling the unlatching action to take place.

The kick-off means for moving locking slide 56 to its unlocking position when the door is slamrned comprises an extension 71 on one side of looking slide 56 in parallel relation with base 12. Extension 71 extends downwardly and to the left as shown in Fi'tan lockiug slide -5 is in its upper or leci-:rng position, this extension is in the path of rotation of (logging teeth of bolt l. When boit 1d is rotated counterclockwise in Figure 1 by virtue of slamming `of the door, the adjacent dogging tooth 15 will engage exte "i n cornrnng locking slide downwardly into unlocking position.

in operation of the embodiment of Figures 1-4, assnme the parts are initially in the position shown in Figure l, with the door in its latching position and locking lever 62 in its unlocking position. Under these conditions, roller 15 Will be disposed between a dogging tooth 15 of bolt 14 and the inclined surface of track 23. The take-up 'action previously described will take place between roller 18 and bolt 1d' under the inuence of spring 19. if it is desired to unlatch the door from the outside, the operator causes the outside door handle (not shown) to engage shoulder 37 of outside rollback 32,, the outside rollback being rotated counterclockwise. This will cause clockwise rotation of lever 27 through the medium of pin 3d and slot 35. lt will be noted that the position of the pin and slot with respect to the axes of Diva-ts 28 and 33 is such as to obtain Optimum movernent of lever 27. Toe 29 will be first withdrawn from shoulder 31 of track 23, freeing the track for clockwise movement about pivot 25. if the door were pulled open at this point, mounting plate ii would be withdrawn tc the left in Figure 1, rotating bolt 1d clockwise. The (logging tooth 15 adjacent roller 18 Would force the roller into retracted position as guided by edge against the action of spring 1. Resistance to this rnovernent would also be presented by track 23, even though the iatter is no longer positively held in position. The reason for this resistance of track 23 to re- 'tracting movement of roller is that toe 29 of holding member 27 would rest against edge of track 23:, being pressed against this edge by the action of spring 36. Some frictional drag would thus be created, which together with the action of spring 19 would offer a variable 'amount of resistance to unlatching of the door.

In normal operation however, the counterclockwise or unlatching movement of outside rollback 32 Will be continued until the position of Figure 4 is reached, looking lever 62 being omitted from this gure for purposes of clarity. When passing to this position, finger 47 of outside rollback 32 will engage shoulder 46 of roller retracting lever Lever 5:7 will be swung clockwise, causing arm 42 thereof to engage reduced portion A83 of roller 1%. The roller will thus be drawn upwardly and to the left until it is out of the path of bolt dogging teeth 15. During this movernent track 23 will be urged clockwise by roller 18, t e latter being held against track 23 by spring 19. The iirniting position of rollback 32 will be reached when the space between its fingers 47 and 55 is occupied by Shoulders and 5d, as shown in Figure 4.

With the parts held in the position of Figura 4 by the outside door handle, bolt 115 will be free to rotate, having no resistance other than the friction of rotation on its own shaft. The door may thus be opened with an absoiute minimum of resistance. Upon release of the outside handle, spring 3d will urge rollback 32 clockwise into its original position shown in Figure 1. The camming action of toe 29 on track edge 38 will move track 23 back to its normal position shown in Figure 1. Roller 18 will be moved back by track 23 to its normal position in engagement with dogging teeth 15. Toe 29 Will engage shoulder 31 to lock track 23 in place, and the parts will be ready for a closiug operation.

When closing the doc-r, bolt 14 Will be rotated clock- Wise by engagement with keeper 26. The dogging tooth 15 adjacent roller 18 will cause the roller to move upwardly and to the left against the urging of spring 19. Roller 18 will drop into position behind dogging tooth 15, and the dogging and take-up action described above will takei it s 'mld be noted that both in the latching and unlatching Operations, a minimum of resistance is introduced by the retracting or unlatching mechanism. In particular, it should be observed that during unlatching of the door, it is not necessary to overcome the Wedgng or f'annning forces which exist between roller 18, track 23 d the bolt, since track 23 is initially released for retracting movernent.

if the door is closed and it is desired to open the door from the inside, inside rollback 49 is rotated countercloci'wise in Figure 2. This movement will cause lever 51 to rotate clockwise in Figure 1, shoulder 54 of this lever engaging finger 55 of outside rollback 32. The outside rollback will thus be rotated counterclockwise into the position of Figure 4, and the unlatching action will take place in the same manner as if the outside rollback were actuated by the outside door handle.

When it is desired to lock the latching mechanisrn, looking slide 56 is moved upwardly either by clockwise rotation of inside rollback 49 in Figure 2 or by counterclockwise rotation of key station cam 69. In either event, looking lever 62 will be rotated counterclockwise in Figure 1, pcsitioning blocking toe 63 in obstructing relation with edge od of lever 27. Unlatching movement of outside roliback 32 will thus be prevented. If inside rollback 48 is then moved counterclockwise from its neutral position in Figure 2, toe 61 of lever 62 will be engaged to unlock rollback 32, allowing unlatching action to take place. lf the door is slammed, bolt dogging teeth 15 will engage extension 71 on slide 56, moving the locking slide and locking lever to unlocking position.

Figures 5, 6 and 7 illustrate another embodiment of the invention which is similar in principle to the first embodiment but wherein a toggle linkage is provided for holding the track in its operative position. A mounting plate '72 is provided having a base '73 and a fiange 74 at right angles. Pivotally supported by mounting plate 72 is a bolt '75 having a plurality of dogging teeth '76. A roller 77 is disposed adjacent dogging teeth 76 and is urged to the right in Figures 5 and 7 by a spring 78. A reaction member or track 79 is pivotally mounted at 81 adjacent the outer edge of base 73. This track extends toward flange 74 and has an edge 82 inclined with respect to the dogging teeth with which roller '77 is engageable, in such manner as to produce the latching and take-up action described with respect to the previous embodiment.

Track 79 is movable between a normal or operative position shown in Figure 5 and a retracted position shown in Figura 7. The means for holding track 79 in its normal or operative position comprises a toggle linkage in the form of an outside rollback 83 and a connecting link 84'. Rollback 83 is pivoted at 85 to the upper portion of base '73 and is provided with a shoulder do for engagement by a portton of an outside door handle (not shown). Link d is pivoted at 37 to'one end of rollback 33 and is pivoted at 88 to an intermediate portion of track 79. The relative positions of pivots 85, 37 and 88 are such that pivot 87 is movable to either side of a line 89 connecting the axes of pivots 35 and S8. In particular, a stop 91 is provided on base '73 which cooperates with one edge 92 of an arm 93 on link 8d. The position of stop 91 is such that it is engaged by arm 93 when the axis of pivot 87 is slightly to the left of line S9, as shown in Figure 5. A spring 94 urges rollback 83 in a clockwise direction so that arm 93 is urged into engagement with ass-4,275'

stop' 91.' When in this position;jit will be seen that an upward forceL ex'erted on track 79 byV roller 77 will beV link 84. As shown in Figure downward movem'ent' of' rollback .95 will cause clockwise rotation' of link' 84 about pivot S8,.in the same m'anne'r' that outside `rollb'a'ck 83 would cause s'uchrotatio'n'. Pivot 87 will thus pass to'th'eright of line 89re`1easing track 79 for movemelnt. It will be noted that spring94; which urges outside' rollback" 83" into its" normal or'in'operative position also serves, throughthe mediumof'link 84, to urge inside' rollback 95 to it's'norm'al position.

As in the previous embodinient, means are provided for positively retracting roller 77 in addition to the release of'tr'a'ck 79, so that bolt 75 will be freely rotatable when the door is being o'pened. As shown, arm 93 is provided with an edge 97 facing a pin 98 on roller 77. The relative disposition of edge 97 and roller' pin 98 is shown' in'Figure 6, wherein it will be' seen that edge 97 is in`alignment with the pin but in spaced relation therewith when the togglelinkage is in its holding position shown in` Figure 5. When link 8'4'is rotated clockwise aboutl pivot 88' during'releas'ing movement of the toggle linkage, edge 97 will approach pin 98. The spacing between these elements m'a' be'su'ch that engagernent of pin 98 by edge 97 will not occur until'pivot 87 of the toggle linkage has passed line 89, releasing track 79 Further'rnovement will bring the parts into the position shown in Figure 7, wherein track`79'and roller 77 are both in retracted position. unlike the emb'odim'e'nt of Figures l-4, track 79 is positively retracted through the toggle linkage, which serves to'dr'a'w the track u'pwardly about pivot 81. The degree of movernent which pivot 87 must undergo before it passes line 89 is preferably small enough to reduce to a minimum the amount of eifort` required in unlatching movenie'nt.

Looking means may also be provided in this embodiment' for preventing unlatching movernent by the inside or'out'side rollb'acks'. As illustrated, a looking lever 99 is provided, this lever being pivoted on the pivot 101 which supports bolt 75. An overcenter spring 102 may be provided between lever 99 and flange 74 for holding the looking lever in either the lower or unlocking position shown in Figure 5 or an upper or locking position. A shoulder 103 is provided at the upper portion of lever 99, this shoulder being' engageable with a locking arm 104 extending from link 84. When lever 99 is rotated' clockwise'in' Figure 5, shoulder 103 will engage the projeeting end of arm 104, preventing clockwise or unlatching movemen't of link 84 about pin 88. Both inside and outside rollbacks will thus be prevented from unlatching the bolt' assemblyf Kick-oif means are' also provided in this embodiment for moving' looking'` lever 99 into its unlocking position when the door is' slammed. This means comprises a kick-off edge 105 on locking lever 99 in alignment with pin`98 of roller 77, as seen in Figure 6. When the door is slammed, roller 77 will be moved to the left in Figures 5 and 6 due to bolt rotation. .The spacing between pin 98 and edge 195 is such that this movement of roller 77 will cause pin 98 to engage the kick-off edge, moving lever 99'into its unlocking position.

Key-actuated means may also be provided for moving locking lever 99 between its positions. As shown, a key-actuated' shaft 106' supported by a' fl'ange 1137 on'b'a'se It should be noted that in 'this` embodiment,

73 has'a pin 108 projecting into a slotted portion 109 on lever 99. Shaft 196 may be rotated to engage the ends of slot19 and thus move lever 99 to either its locking or its unlocking position.

in operation of the embodiment of Figures 5 and 7,

assurne an initial condition in which the boltassembly isas shown in Figure 5, and the door is closed. If it is desired to open the door, leave the car and close and lock the door, inside rollback 95 will be moved downwardly" in Figure 5. This Will cause rotation of link 84tabout compression of the toggle linkage until pivot 87 passes line 89; Further rotational movement will causethe togglelinkage to move into the position of Figure 7. This Vmovement will cause retraction of track 79 and Will also t'aufe retraction of roller 77, pin 98 of the latter beingi engaged by arrn 93. When the position of Figure 7 is f reached, bolt will be Vperrnitted free rotation so that the door may be opened with ease.

The release of inside rollback will cause the parts to return to the position shown in Figure 5. When the door is slammed, dogging teeth 76' will rotate counterclockwise in Figure 5, retracting roller 77 against the urging of spring 78, until the roller falls behind the ad- ,iacentV dogging tooth. During this movernent track 79 will remain stationarr being held by the toggle linkage. Spring 78 Wifl urge roller 77 to the right, causing latching and take-up action to take place as described above. Key shaft 1% may then be rotated to swing lockinglever 99 clockwise in Figure 5, engaging locking arm-104 to prevent unlatching movement.

Figures 8 and 9 illustrate still another embodiment of the invention which is generally similar to that of Figures 5-7 but in which the track or reaction member is pivoted.

at the opposite end. As shown, the bolt assembly comprises a mounting plate generally indicated at 111 having a base 112 and a fiange 113. A bolt 114 is pivotall supported by mounting plate 111 and roller 115 serves as the dogging 'and' take-up means for this bolt,l as in the previous embodiments. A track 116 is provided for roller 115, this track having an edge which cooperates with the roller to produce the latching and take-up functions of the device. in this modification, track 115 is pivoted at 17 adjacent flange 113 and extends toward the outer edge of base 112. A connecting link 118 is pivoted at 119 to the outer end of the track 116 and is pivoted at its other end to an outside rollback 121 by means of a pivot 122. Outside rollback 121 is pivoted at 123 to the upper portion of base 112, in such manner thatl pivots 119, 122 and 123 form part of a toggle linkage for holding track 116 in position. In particular, the aXis of intermediate pivot 122 is movable slightly to the left of a line 124 connecting the aXes of pivots 119 and 123. A stop 125 is provided on base 112 for limiting the leftward movement of connecting link 118, thus providing a predetermined holding position for the toggle linkage. A spring 126 is connected between outside rollhack 121 and base 112 urging the rollback in a counterclockwise' direction, and thus urging the toggle linkage into its holding position against stop 125. An extension 127 on connecting link 118 serves to limit movernent of the toggle linkage in itsV releasing direction. As shown in Figure 9, this extension is engageable with a fiange 128 on the outer edge of base 112 to limit movement of the toggle linkage.

The meansV for positively retracting roller 115 in this embodirnent comprises a roller retracting lever 129 pivoted at 131 on base 112. This lever has a shonlder 132 at one end thereof disposed between a pair of fingers 133 and 134 on outside rollback 121. Lever 129'is further provided with an arm135 extending downwardly and in spaced alignment with a pin 136 on roller 115.; Arm 135 is engageable with pin 136 when lever 129Visrota'ted clockwise in Figura 8, to retract roller 115 in the same nianner as in the previous embodiments. i Preferably,

ally, this movement will cause very slight finger 133 is slightly spaced from shoulder 132 to permit the toggle linkage to release track 116 before roller 115 begins its retracting movement.

An inside rollback, shown partially at 137, is also provided in this embodiment of the invention. The inside rollback, which may be pivoted on fiange 113 of the mounting plate, is movable downwardly in Figure S into engagement with an arm 138 on lever 129. The subsequent clockwise rotation of lever 129 will cause engagement of shoulder 132 with finger 134 on outside rollback 121. The toggle linkage will thus be broken, and track 116 as well as roller 115 retracted by inside rollback movement.

It is believed the operation of the embodiment of Figures 8 and 9 is clear from the figures and from the description of operation of the previous modifications. Starting with the condition shown in Figure 8, if it is desired to unlatch the door from the outside, outside rollback El is rotated counterclockwise in Figure S by the outside door handle (not shown). The toggle linkage comprising the outside rollback and link 118 will move from its track holding position to its track releasing position, permitting retracting movement of track 116. At the same time, lever 129 will be rotated clockwise in Figure 8, causing engagement of arm 135 with pin 136 of roller 115. The roller will thus be retracted out of engagement With bolt 114, the latter being permitted free rotation during the door opening movement, as shown in Figure 9.

While it will be apparent that the preferred embodiments of the invention disclosed are well calculated to fulfill the objects above stated, it will be appreciated that the invention is susceptible to modification, Variation and change without departing from the proper scope or fair meaning of the subjoined claims.

What is claimed is:

1. In a vehicle door latching mechanism, a rotatable bolt, a dogging member movable between an unlatching position free from said bolt and a latching position in engagement with said bolt, a spring urging said (logging member into its latching position, a reaction member mounted adjacent said dogging member, said reaction member being movable between a retracted position and an operative position maintaining said dogging member in latching engagement with said bolt, holding means for said reaction member, said holding means being movable between a releasing position permitting movement of said reaction member toward its inoperative position and a holding position preventing such movement, a retracting member movable between an inoperative position and a retracting position moving the dogging member into its unlatching position, inside and outside rollbacks, and means responsive to movement of either of said rollbacks for moving said holding means into its releasing position and moving said retracting member into its retracting position.

2, A bolt assembly comprising a multi-toothed rotary bolt, a roller engageable with said bolt and movabie between a latching position and an unlatching position away from said bolt, a spring urging said roller into its latching position, a track adjacent said roller and engageable therewith, said track being so inclined relative to said bolt teeth as to cause said roller to rotate saic bolt in a latching direction as said roller is advanced along said track by said spring, means movabiy supporting said track for movement between an operative position in engagement with said roller and a retracted position, means for positively holding said track in its operative position, a roller retracting member movable between an inoperative position and a roller retracting position holding said roller in its unlatching position, a rollback movable between a normal position and an unlatching position, and means responsive to movement of said rollback to its unlatching position for moving said holding means to its releasing position and moving said roller retracting member to its roller retracting position.

3. In a bolt assembly, a rotary multi-toothed bolt, a roller movable between an unlatching position away from said bolt and a latching position in engagement with the bolt teeth, a spring urging said roller into its latching position, a track pivotally mounted adjacent said roller, said track being movable between a retracted position and an operative position in engagement with said roller, the track when in its operative position providing a reactive surface for said roller enabling the latter to perform a dog-'ng function with respect to said bolt, a holding member mounted adjacent said track, said holding member being movable between a releasing position permitting movement of said track toward its retracted position and a holding position positively holding said track in its operative position, a roller retracting lever mounted adjacent said roller, said lever being movable between an inoperative position and a roller retracting position holding said roller in its unlatching position, resilient means urging said track holding member into its holding position and said roller retracting lever into its inoperative position, an outside rollback movable between a normal position and an unlatching position, and means responsive to movement of said outside rollback to its unlatching position for moving said holding means to its releasing position and moving said roller retracting lever to its roller retracting position.

4. The combination according to claim 3, further provided with an inside rollback movable between a normal position and an unlatching position, and means responsive to movement of said inside rollback to its unlatching position for moving said outside rollback to its unlatching position.

5. The combination according to claim 3, further provided with a locking member movable between an unlocking position and a looking position preventing movement of said holding member to its releasing position and said roller retracting lever to its roiler retracting position.

6. The combination according to claim 3, said means responsive to movement of the outside rollback comprising a positive connection between said outside rollback and said holding member, and a lost-motion connection between said outside rollback and said roller retracting lever, said lost motion being such that upon movement of said outside rollback, said holding member will be moved to its releasing position before said roller retracting lever starts movement of said roller to its unlatching position.

7. The combination according to claim 3, further provided with a stationary guide adjacent said roller so disposed as to guide said roller away from said track pivot when the roller is moved toward its unlatching position.

8. In a bolt assembly, a mounting plate having a base and a fiange, a multi-toothed rotary bolt supported by said base, a roller mounted adjacent said boit and movable between an unlatching position away from the bolt and a latching position in engagement with the bolt teeth, a spring urging said roller toward its latching position, a track pivotally mounted on said base and movable between a retracted position and an operative position adjacent said roller, said track when in its operative position being so disposed relative to said bolt teeth as to present a reactive surface enabling the roller to perform a dogging function, a stationary guide adjacent said roller so disposed as to guide said roller away from said track pivot When the roller is moved in an unlatching direction, a shoulder at the outer end of said track, a holding member pivoted on said base and having a toe engageable with said shoulder, said toe being movable between a releasing position away from said shoulder and a holding position engaging said shoulder to hold said track in its operative position, a guiding edge at the outer end of said track for guiding said holding member when said track is moved away from its operative position, an outside rollback pivoted on said base, a spring urging said outside rollback into its normal position, a pin-and-slot connection between said outside rollback and said holding memher, wherebymoveinent of? said outside.V rollback towa'rd its unlatching' position will cause 'movement of 'saidf hold; ingmember towarditsreleasing position, arollerretract-` holding Vsaidroller in its unlatohingposition, a shoulder'` on said roller retracting lever, a finger on said outside rollback, saidf'finger being .in spaced relation with said shoulder when said outside rollback is in its normal position and being engageable with said shoulder to move said lever'into its rolle'r retracting position when` said outside rollback is moved toitsunlatching position, the spaoing between said fingeriand said shoulder'being such' as to permit movement of said holding member toe away from said tracklshoulder before'engagementbetween the finger and'levershoulder occurs,antinsiderrollback pivoted on.

saidtflangeand movable between a normal and Van` unlatching position, a connecting lever'pivotedon said base and having a first arm engageable by said inside rollback when moved toward its unlatching position, a second arm on said connecting lever having a shoulder disposed adja'crent the shoulder of Vsaid roller retracting lever, and a second finger on said outsiderollback engageable by: said,

connecting lever shoulder, whereby movement ot'` 'said inside rollback toward its unlatching positionl will cause' movement ofsaid outside "rollback toward itsunlatohing position 1 i 9. The combination according to claim 8, furtherpro-f vided with a looking slide on said mounting plate fiange, an overce'nter spring for holding said looking slide in either a looking or an unlocking position, a looking lever pivoted on said base andmovable by said slide between looking and unlocking 'positions, a looking Varm on said looking lever having a shoulderV disposable in obstructing relation with said holding 'member when said locking arm is in its looking position, whereby movement of said holding member from its holding position is'prevented, and a portion on said looking lever disposable adjacent said inside rollback when the looking lever is in its looking position, whereby initial movement of said inside rollback toward its unlatching position will move said looking lever into its unlocking'. position. i

10. The combination accordingrto claimv 9, said locking slide being furtherz provided with an extension -therr-V on, said extension being positionable in the path of'said bolt teeth when the looking slide is in looking position, whereby latching rotation of said bolt teeth will cause movement of said looking) slide into its unlocking position.` 1,1. In a bolt assembly, a multi-toothed rotary bolt, a roller adjaoent 'said bolt and movable between an `unlatching position ,away from said bolt Vand a latching position in engagement'with 'said bolt, a spring urging said roller intoV its. latching position, a trackpivoted adjacent said roller `and movable between aV retracted position and an operative position adjacent said roller, said track when in its loperative position presenting a reactiveV surface to said roller enabling the iro'ller to perform a dogging function, an outside rollback pivoted adjacent said track and movable between a' normal poi' tion and an unlatching position, a spring urging said out-l side rollback into its normal position, Va .connecting link pivoted to said outside rollback and to said track, .said outside rollback and connecting link forming a toggle linkage for moving said track between its operative and retracted positions, a stop limiting movementmof said outside rollback by said spring past its normal position, whereby said track will be positivcly he'ld'in its oper-j ative position with 'said toggle linkage 'slightly past' its overcenter position, an arm in spaced relation With' a portion of said roller, said arm being movableA between an inoperative position .when said toggle linkage is in its holding position anda 1roller retracng position When Vsaid outside rollback is movedto its -unlatching posi= tion, saidarm .when in its.rollerretractingposition holding said roller in izts unlatchingpositiomnd means?` responsive to movement of said ioutsidegrollback to its unlatching position for movingsaid larn to itszrollenretracting position. i'

12. Thecombination according l.to claimx'll, furtherprovided with an inside rollback movable l'between a normal position: and .an unlatching position, and means' 13. The lcombination faccordingto claim 12, said rollerl retracting arm being formed on said connectinglink, said means responsive to inside rollback'movement cornprising a second .arms on aid'connectin'g link engageable by said inside'rollback when moved toward its unlatching position; 1 .i

14. The combination'accoi'ding to claim` 11, further provided with a looking leverz'movable between la re-' tracted positionand a looking position in obstructingrelation with a portion vof said 'connecting link, whereby said toggle linkage is prevented from moving from its holding position.

15. The combination according to claim 14, said lock-` ing lever being further provided with ta kick-ofi surface positionable adjacent a portion'of said roller when the looking lever is in its looking position, whereby said roller will engage said kick-off surface when moved to-` wards its unlatching position to cause movement of said looking lever into its unlocking position..

16. The combination according to claim V11, said roller.

retracting arm being formod as vpart of a pivoted lever, i

said means responsive `to .outside rollback movementV comprising a second armon said lever having an opera-.

17. In a door latching mechanism, a bolt rotatable o in a latching direction and 'an Vunlatching direction, first and second angularly relatedsurfaces on said bolt, a' dogging member having an operative position in op-: posed relation with said surfaces and aretracted position, rotation of said bolt in its`latchiug direction urgingl said dogging member in a first'pa'th of movement, rotation of said bolt in its'unlatching directionurging said dog-.. ging member in 'a scondpath of movement, reaction means movable between an operative position and a re-, tractediposition, a surface on said reaction `means en-. gageable with said .dogging member, said last-mentioned surface being. in a non-.obstructing position withrespcct to said first path of movement but in an obs'tructing position with respect to 'said second. path' of movementwhen said reaction means is inf its operative position, said last-mentioned surface further being in a non-obstrncting position with respect to both paths of movement when the reaction means is in itsretracted position, means separate from said ;logging member for holding said reaction means in its operative position to prevent movem'ent of the dogging member in its second path, and operating means for releasing said holdingfmeans, said operating means' further including a member engageable with said dogging member for positivcly moving the ;dogging mernber toward its retracted position.

18. The combination according to claim 17, further provided with a spring urging said dogging member into its` operative position.

References Cited in the ilc of this patent UNITED STATES 'PATENTS 2,l73,765 Potter SepL- l9, 1939 2,259,67.0 Van Voorhees 0ct..21, 19,741

2,507,19.6 Dell .May d9,.. 195,0 

